<html> <head> <meta content="text/html; charset=ISO-8859-1" http-equiv="Content-Type"> </head> <body text="#000000" bgcolor="#FFFFFF"> Hello the numbers are mass fractions as opposed to volume fractions. Perhaps this explains your differences. Best regards, Hermann <div class="moz-cite-prefix">Am 27.03.2014 17:16, schrieb Estelle Hilaire: </div> <blockquote cite="mid:53344EC8.5080105@creatis.insa-lyon.fr" type="cite">Dear Gate users, I'm wondering how the ratios are calculated in the file "GateMaterials.db" (cf. attached file). Because for example for "Air", it is supposed to be 78.084% of nitrogen, 20.946% of oxygen, 0.934% of argon etc. But in the file, the values stored does not match with these ones. So either there is a mistake or an other calculation, which make me wonder if the ratios for the material I want to use (LYSO) are correct, and if so how are they calculated. Thank you for your help, Estelle Hilaire <fieldset class="mimeAttachmentHeader"></fieldset> <pre wrap="">_______________________________________________ Gate-users mailing list <a class="moz-txt-link-abbreviated" href="mailto:Gate-users@lists.opengatecollaboration.org">Gate-users@lists.opengatecollaboration.org</a> <a class="moz-txt-link-freetext" href="http://lists.opengatecollaboration.org/mailman/listinfo/gate-users">http://lists.opengatecollaboration.org/mailman/listinfo/gate-users</a></pre> </blockquote> </body> </html>